My Porta Potti died during a 2-week boondocking trip because I couldn’t find a replacement blade seal. I sat there for 3 days with a toilet I couldn’t flush. The lesson: know your Porta Potti model number and keep spare parts in the RV before you need them.
Reliance Products (formerly Porta Potti) makes the most popular portable toilets in the RV market. But their parts system is confusing — parts from one model don’t always fit another. This guide tells you exactly which parts fit which models and where to buy them.
Porta Potti Model Numbers You Need to Know
Porta Potti models use a numbering system that tells you everything about the toilet’s capacity and features.
Porta Potti 300 series. The original portable toilet. 1.3-gallon waste tank, 0.5-gallon fresh water tank. Basic model with no flush mechanism beyond a hand pump. Cost: $60-$80. Seat is the smallest in the Porta Potti line — 13 inches wide.
Porta Potti 365 series. The most popular model. 1.3-gallon waste tank, 1.5-gallon fresh water tank with a foot pump flush. Cost: $80-$120. Seat is 14 inches wide. Available in multiple colors. This is the model most RVers own.
Porta Potti 565E. Electric flush model. Same waste tank size but with an electric pump that delivers a stronger flush. Cost: $150-$200. Battery-operated (12V). Heavier at 18 pounds vs 10 pounds for the 365.
Porta Potti 765. Larger capacity. 2.5-gallon waste tank, 1.8-gallon fresh water tank. Ideal for families or extended trips. Cost: $120-$160. Seat is 15 inches wide.
Parts That Break (And What to Replace Them With)
Blade seal. The rubber seal that closes the waste tank after each flush. Lasts 1-2 years with daily use. When it cracks or hardens, the toilet leaks at the base. Replacement seal for 365 series: Reliance Part #70315. Cost: $8-$10.
Gasket seal. The O-ring that seals the waste tank to the toilet bowl. Cracks from UV exposure and temperature changes. Replacement: Reliance Part #70320. Cost: $5-$8.
Flush pump. The foot pump on the 365 series wears out after 3-5 years. Symptoms: weak flush, no flush, or leaking from the pump base. Replacement pump: Reliance Part #70310. Cost: $15-$20.
Vent cap. The small cap on top of the waste tank that allows airflow. Loses elasticity over time, causing odors to escape. Replacement: Reliance Part #70325. Cost: $4-$6.
Seat cover. The plastic lid on top of the toilet. Cracks from impact or extreme temperatures. Replacement seat for 365: Reliance Part #70330. Cost: $12-$18.
Parts Compatibility Chart
| Part | 300 Series | 365 Series | 565E | 765 Series |
|——|———–|———–|——|———–|
| Blade Seal | 70315 (fits all) | 70315 (fits all) | 70315 (fits all) | Larger size needed |
| Gasket Seal | 70320 | 70320 | 70320 | Different size |
| Flush Pump | N/A | 70310 | 70310 (electric version) | N/A |
| Seat | 70330 (300) | 70330 (365) | 70330E (565E) | 70330 (765) |
| Tank Cap | 70325 | 70325 | 70325 | 70325 |
Key takeaway: the blade seal (70315) fits all Porta Potti models. This is the one part you can always keep in stock regardless of your model.
Where to Buy Porta Potti Parts
Reliance Products direct. Best prices on genuine parts. Website: relianceproducts.com. Shipping: 3-5 business days domestic.
Amazon. Convenient but markups are 20-40% above MSRP. Genuine Reliance parts available. Beware of counterfeit seals — they look identical but don’t seal properly.
RV parts stores. Camping World, Lippert, and local RV dealers carry the most common Porta Potti parts. Higher prices but immediate availability — worth the premium if you’re stranded without a working toilet.
eBay. Good source for discontinued Porta Potti parts. Be careful about fitment — list the exact model number in your search.
Here’s my take: order a blade seal (70315) and a gasket seal (70320) every time you buy tank treatment chemicals. They cost $13 total and save you from being stranded. Keep them in your RV’s storage — they last indefinitely in a cool, dry place.
Portable Toilet Maintenance Tips
– Clean the blade seal every dump. Wipe it with a damp cloth before reattaching the waste tank. Debris on the seal prevents proper closure.
– Use only Porta Potti chemicals. Generic chemicals sometimes contain ingredients that degrade the rubber seals. Thetford Aqua-Kem is Porta Potti-compatible.
– Store indoors in winter. Extreme cold makes the plastic brittle. If you must store outside, wrap the toilet in a moving blanket.
– Check the gasket seal before long trips. A failing gasket causes leaks during transport. Apply a thin layer of silicone grease to the gasket before connecting the waste tank.
References
– Reliance Products Porta Potti Parts Catalog — relianceproducts.com
– Porta Potti 365 Owner’s Manual — relianceproducts.com
– RV Portable Toilet Chemical Compatibility — camco.com
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*See also: [RV Toilet Maintenance & Repair Complete Guide](https://rv-toilet.com/rv-cassette-toilets-how-they-work-are-they-worth-it)*
[Related: RV Cassette Toilets](https://rv-toilet.com/rv-cassette-toilets-how-they-work-are-they-worth-it)